Gemstone



FIG. 1 is a top perspective view of a gemstone showing my new design;

FIG. 2 is a front side view thereof, wherein the view taken from the back side is identical to the front side view;

FIG. 3 is a left side view thereof, wherein the view taken from the right side is identical to the left side view;

FIG. 4 top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

CLAIM I claim the ornamental design for a gemstone, as shown and described. 